[덧셈계산기]

/////activity_main.xml

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="첫번째 숫자"
/>
<EditText
android:id="@+id/e1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="여기에 입력하세요"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="두번째 숫자"
/>
<EditText
android:id="@+id/e2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="여기에 입력하세요"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:text="결과"
android:textSize="30dp"/>

<TextView
android:id="@+id/t1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:text="0"
android:textSize="30dp"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">

<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:src="@drawable/girl"/>
<Button
android:id="@+id/b1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="50dp"
android:text="결과확인"/>
</LinearLayout>
</LinearLayout>

 

/////// mainActivity.java

package com.example.basicsum;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
EditText e1, e2;
TextView t1;
Button b1;
String input1, input2;
int sum;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

e1 = (EditText) findViewById(R.id.e1);
e2 = (EditText) findViewById(R.id.e2);
t1 = (TextView) findViewById(R.id.t1);
b1 = (Button) findViewById(R.id.b1);

b1.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
input1 = e1.getText().toString();
input2 = e2.getText().toString();
sum = Integer.parseInt(input1) + Integer.parseInt(input2);
t1.setText(Integer.toString(sum));
}
});
}
}